Tagged Questions

The classical theory of electric and magnetic fields, both in the static and dynamic case. Also covers general questions about magnets, electric attraction/repulsion etc. Distinct from electrical-engineering.

Brief Background
A coaxial cable is an example of a transmission line. A transmission line can be analyzed by using a distributed element model in which there are a repeating set of per unit length ...

I'm making a lab report where I've used a Helmholtz coil and a magnet to find Earth's magnetic field intensity in the area by relating the frequency of oscillation of the magnet when a certain current ...

How does one solve the tensor differential equation for the relativistic motion of a partilcle of charge $e$ and mass $m$, with 4-momentum $p^a$ and electromagnetic field tensor $F_{ab}$ of a constant ...

How does a Fresnel rhomb work (half and quarter wave plate)?
I am aware of birefringence, which creates a phase shift of $\Delta\phi=\dfrac{2\pi\Delta nL}{\lambda_0}$. But this doesn't explain how a ...

Let's say I had an arbitrarily shaped permanent magnet, with total magnetic moment $M_{0}$. Ways to calculate the magnetic field of this magnet include an analytic solution (if one exists), as well ...

I have again an old question from a comprehensive exam I took a couple of months ago. Lucky for me one could pick 5 out of 8 questions, because on some of the problems I didn't even know how to start. ...

Which of these is the current (also, what about voltage?) induced by an EMP pulse within a circuit most dependent on?
The area of the region enclosed by the circuit
The orientation of that area with ...

I'm trying to simulate the degenerative Anderson model. So depending on an energy difference first orbital and afterwards spin magnetism occurs. First i try to solve an easier ansatz with a limitation ...

If I have a 2DEG with a voltage in the $x$-direction and a $B$-Field in the $z$-direction (so I also get a hall-voltage in the $y$-direction (classicaly)).
But if I do this stuff at low temperatures I ...

When superconductors reach their "threshold temperature" their electrical resistance turns 0. This makes the magnetic field lines not pass through the superconductor but instead bend itself around it ...

I've noticed that there's a lack of symmetry in the definition of the Poynting vector, being defined as:
$$S=E\times H$$
meaning, using the electric field cross the magnetizing field instead of the ...

I have an arrangement that is as follows :
(1) inner cylinder(radius r1) filled with water
(2) outer cylinder(concentric, radius r2>r1) made of glass
I have a sensor S1 at radius r(r1) at angle beta. ...

In the context of classical electromagnetism, is it always possible to reproduce the action of a large number of half-wave plates and quarter wave-plates with that of a single half-wave plate and a ...

There are two types of solenoids: one cylindrical, one spherical. Let's assume the dimensions of the cylindrical solenoid are set such that its base radius is that of spherical solenoid $a$, and the ...

Usually it is said that black holes cannot have electric or magnetic dipole, only electric charge and angular momentum are allowed quantities besides mass
So, it would seem that black holes behave as ...

In this video, what material is on top of the superconductor disk that keeping it cold? Is it just a circular chunk of dry ice?
http://www.youtube.com/watch?v=Ws6AAhTw7RA
I'm planning on recreating ...

For magnetic circuit there is an equation NI=HL. This equation is obtained by applying Ampere's law. H is magnetic field intensity and L is the length of the circuit. In following picture the equation ...

How can we obtain a voltage with no magnetic field is applied to the semiconductor?
They told me that if the points where I measure the potential difference are not at the same level I would obtain a ...

Many cereals (from the supermarket) are attracted by a magnet. This can be seen by crushing the cereals into a very fine powder and approaching a strong magnet.
The usual explanation is that cereals ...

When a charged particle moves thru magnetic field, it is affected by Lorentz force. But does the magnetic field surrounding the particle experience a force opposite to the particles Lorentz force ? ...

Would it be possible to fill hollow non-magnetic blocks of metal with ferromagnetic fluids and use magnetic fields to move the blocks in a certain way? I am only asking this because I think that if it ...

We know that,the shape of electric field line in a cylinder under varying magnetic field is circle,and I wonder,what's the situation if it is a piece of metal with rectangular cross section?
I think ...